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also provide temperature information to their respective temperature
controller. Location of the sensors is determined by the operator’s
completion agency.
Power for the indicator is furnished by the 28V Essential DC bus through
the CKPT/CABIN TEMP IND circuit breaker. The indicator is calibrated in
degrees Fahrenheit, with a maximum display value of 199° F.
G. Equipment Cooling System:
(See Figure 9.)
Electric cooling fans are installed to force cooling air to the display unit
cathode ray tubes (CRTs), center pedestal equipment, radio racks and
nose compartment. With electrical power applied, operation of most fans is
automatic and is transparent to the flight crew.
For aircraft 1000 through 1155 (excluding 1034) having ASC 87, and
aircraft 1034, 1156 and subsequent, selection of the PILOT, EICAS or
COPILOT DISPLAY switch while on the ground energizes both CRT
cooling fans. In flight, the fans operate continuously, regardless of switch
position.
Supplemental cooling air for center pedestal equipment is provided by a
fan mounted in the aft right side of the pedestal. The fan is not
thermostatically controlled and operates whenever 28V Right Main DC bus
power is available.
With electrical power applied and the main entrance door open, the righthand
radio rack cooling fan operates. On aircraft 1156 and subsequent, a
RH RR FAN MAN ON switch is installed on the copilot’s side console to
provide additional manual control of the right-hand radio rack fan.
Additionally, blue RH RR FAN AUTO, RH RR FAN FAIL and LH RR FAN
FAIL annunciators are installed on the copilot’s side console to show radio
rack fan status.
With the aircraft on the ground and nose compartment temperature above
90° F, a thermal switch opens the nose compartment cooling valve. This
energizes a fan and illuminates an amber N COOL VALVE OPEN
annunciator on each side of the flight panel. Once airborne, a nutcracker
relay closes the valve. Should the valve fail to close in flight, the N COOL
VALVE OPEN annunciators will illuminate.
3. Controls and Indications:
(See Figure 8 and Figure 9.)
A. Circuit Breakers (CBs):
The airflow and temperature control system is protected by the following
CBs:
OPERATING MANUAL
PRODUCTION AIRCRAFT SYSTEMS 2A-21-00
Page 27
May 30/02
Revision 7
Circuit Breaker Name: CB Panel: Location: Power Source:
L AIR COND PO C-13 ESS DC Bus
R AIR COND PO D-13 ESS DC Bus
CABIN PRESS 115V PO D-11 ESS AC Bus, φA
CABIN PRESS 28V PO B-11 ESS DC Bus
CABIN PRESS IND PO A-12 ESS DC Bus
CABIN TEMP CONT PO D-14 ESS DC Bus
CKPT/CABIN TEMP IND PO A-11 ESS DC Bus
CKPT TEMP CONT PO B-13 ESS DC Bus
DISPLAYS FAN #1 CP D-5 ESS DC Bus (1)
DISPLAYS FAN #2 CP D-6 R MAIN DC Bus
(2)
NOSE COMPT COOL FAN CP M-1 R MAIN DC Bus
(3)
NOSE COMPT COOL VLV CP L-1 R MAIN DC Bus
PED COOL FAN CP J-1 R MAIN DC Bus
LH RR COOL FAN CP K-1 ESS DC Bus
RH RR FAN CON CP I-1 ESS DC Bus
RH RR COOL FAN CP H-2 ESS DC Bus
SGL PACK PO C-14 ESS DC Bus
L TEMP CONT AC P H-11 ESS AC Bus, φA
R TEMP CONT AC P I-11 ESS AC Bus, φA
NOTE(S):
(1) ESS AC bus, φA, on aircraft 1000, 1002 through 1095 (excluding 1034)
not having ASC 49/49A.
(2) R MAIN AC bus, φB, on aircraft 1000, 1002 through 1095 (excluding
1034) not having ASC 49/49A.
(3) R MAIN AC bus, φB, on aircraft 1000 and 1002 through 1095, excluding
1034.
B. Caution (Amber) CAS Messages:
CAS Message: Cause or Meaning:
L-R COOL TURB HOT Cooling turbine discharge air above 450° F (232° C).
DU FAN 1-2 FAIL Respective DU cooling fan has failed.
FWD RADIO RACK HOT Inside radome, left or right equipment bay temperature
has exceeded 200° F (93° C).
C. Other Indications:
Indication: Cause or Meaning:
Amber N COOL VALVE OPEN
Annunciator
(Pilot’s/Copilot’s Flight Panel)
Nose compartment cooling valve is open.
Blue LH RR FAN FAIL Annunciator
(Copilot’s Side Console) (1) Left-hand radio rack cooling fan has failed.
Blue RH RR FAN FAIL Annunciator
(Copilot’s Side Console) (1) Right-hand radio rack cooling fan has failed.
OPERATING MANUAL
2A-21-00 PRODUCTION AIRCRAFT SYSTEMS
Page 28
May 30/02
Revision 7
Indication: Cause or Meaning:
Blue RH RR FAN AUTO Annunciator
(Copilot’s Side Console) (1)
Right-hand radio rack cooling fan operating
automatically.
Blue RH RR FAN MAN ON
Annunciator
(Copilot’s Side Console) (1)
Right-hand radio rack cooling fan operating
manually.
　
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